/**
*      author: Y_Yao
*      created: 2024-12-05 22:25:38
**/

#include<bits/stdc++.h>

#define int LL
using namespace std;
using LL = long long;
const LL LLINF = 1e18;
const int INF = 0x3f3f3f3f;
const int N = 50 + 7;
string s[N];
int n,m;

void solve()
{
    cin >> n >> m;
    for(int i = 1;i <= n;i++)
    {
        cin >> s[i];
    }

    int sum = 0;
    int cnt = 1;
    for(int i = 1;i <= n;i++)
    {
        sum += s[i].size();
        if(sum == m)
        {
            cout << i << endl;
            return;
        }
        if(sum > m)
        {
            cout << i - 1 << endl;
            return;
        }
        cnt++;
    }

    cout << n << endl;
}

signed main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);

    int t = 1;
    cin >> t;
    while(t--)
    {
        solve();
    }
    return 0;
}